Write the smallest $8$ -digit odd number using all odd digits.

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Solution

Forming the smallest $8$ -digit odd number using all odd digits:
While forming a smallest number using given digits, arrange the digits in ascending order from left.
To form a smallest number by repeating its digits, repeat the smallest digit.
Odd digits are $1, 3, 5, 7, 9$ .
Thus, the smallest $8$ -digit odd number using all odd digits is $1, 11, 13, 579$ .

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